1/* GNU/Linux/x86 specific low level interface, for the in-process 2 agent library for GDB. 3 4 Copyright (C) 2010, 2011 Free Software Foundation, Inc. 5 6 This file is part of GDB. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 20 21#include "server.h" 22 23/* GDB register numbers. */ 24 25enum i386_gdb_regnum 26{ 27 I386_EAX_REGNUM, /* %eax */ 28 I386_ECX_REGNUM, /* %ecx */ 29 I386_EDX_REGNUM, /* %edx */ 30 I386_EBX_REGNUM, /* %ebx */ 31 I386_ESP_REGNUM, /* %esp */ 32 I386_EBP_REGNUM, /* %ebp */ 33 I386_ESI_REGNUM, /* %esi */ 34 I386_EDI_REGNUM, /* %edi */ 35 I386_EIP_REGNUM, /* %eip */ 36 I386_EFLAGS_REGNUM, /* %eflags */ 37 I386_CS_REGNUM, /* %cs */ 38 I386_SS_REGNUM, /* %ss */ 39 I386_DS_REGNUM, /* %ds */ 40 I386_ES_REGNUM, /* %es */ 41 I386_FS_REGNUM, /* %fs */ 42 I386_GS_REGNUM, /* %gs */ 43 I386_ST0_REGNUM /* %st(0) */ 44}; 45 46#define i386_num_regs 16 47 48/* Defined in auto-generated file i386-linux.c. */ 49void init_registers_i386_linux (void); 50 51#define FT_CR_EAX 15 52#define FT_CR_ECX 14 53#define FT_CR_EDX 13 54#define FT_CR_EBX 12 55#define FT_CR_UESP 11 56#define FT_CR_EBP 10 57#define FT_CR_ESI 9 58#define FT_CR_EDI 8 59#define FT_CR_EIP 7 60#define FT_CR_EFL 6 61#define FT_CR_DS 5 62#define FT_CR_ES 4 63#define FT_CR_FS 3 64#define FT_CR_GS 2 65#define FT_CR_SS 1 66#define FT_CR_CS 0 67 68/* Mapping between the general-purpose registers in jump tracepoint 69 format and GDB's register array layout. */ 70 71static const int i386_ft_collect_regmap[] = 72{ 73 FT_CR_EAX * 4, FT_CR_ECX * 4, FT_CR_EDX * 4, FT_CR_EBX * 4, 74 FT_CR_UESP * 4, FT_CR_EBP * 4, FT_CR_ESI * 4, FT_CR_EDI * 4, 75 FT_CR_EIP * 4, FT_CR_EFL * 4, FT_CR_CS * 4, FT_CR_SS * 4, 76 FT_CR_DS * 4, FT_CR_ES * 4, FT_CR_FS * 4, FT_CR_GS * 4 77}; 78 79void 80supply_fast_tracepoint_registers (struct regcache *regcache, 81 const unsigned char *buf) 82{ 83 int i; 84 85 for (i = 0; i < i386_num_regs; i++) 86 { 87 int regval; 88 89 if (i >= I386_CS_REGNUM && i <= I386_GS_REGNUM) 90 regval = *(short *) (((char *) buf) + i386_ft_collect_regmap[i]); 91 else 92 regval = *(int *) (((char *) buf) + i386_ft_collect_regmap[i]); 93 94 supply_register (regcache, i, ®val); 95 } 96} 97 98ULONGEST __attribute__ ((visibility("default"), used)) 99gdb_agent_get_raw_reg (unsigned char *raw_regs, int regnum) 100{ 101 /* This should maybe be allowed to return an error code, or perhaps 102 better, have the emit_reg detect this, and emit a constant zero, 103 or something. */ 104 105 if (regnum > i386_num_regs) 106 return 0; 107 else if (regnum >= I386_CS_REGNUM && regnum <= I386_GS_REGNUM) 108 return *(short *) (raw_regs + i386_ft_collect_regmap[regnum]); 109 else 110 return *(int *) (raw_regs + i386_ft_collect_regmap[regnum]); 111} 112 113#ifdef HAVE_UST 114 115#include <ust/processor.h> 116 117/* "struct registers" is the UST object type holding the registers at 118 the time of the static tracepoint marker call. This doesn't 119 contain EIP, but we know what it must have been (the marker 120 address). */ 121 122#define ST_REGENTRY(REG) \ 123 { \ 124 offsetof (struct registers, REG), \ 125 sizeof (((struct registers *) NULL)->REG) \ 126 } 127 128static struct 129{ 130 int offset; 131 int size; 132} i386_st_collect_regmap[] = 133 { 134 ST_REGENTRY(eax), 135 ST_REGENTRY(ecx), 136 ST_REGENTRY(edx), 137 ST_REGENTRY(ebx), 138 ST_REGENTRY(esp), 139 ST_REGENTRY(ebp), 140 ST_REGENTRY(esi), 141 ST_REGENTRY(edi), 142 { -1, 0 }, /* eip */ 143 ST_REGENTRY(eflags), 144 ST_REGENTRY(cs), 145 ST_REGENTRY(ss), 146 }; 147 148#define i386_NUM_ST_COLLECT_GREGS \ 149 (sizeof (i386_st_collect_regmap) / sizeof (i386_st_collect_regmap[0])) 150 151void 152supply_static_tracepoint_registers (struct regcache *regcache, 153 const unsigned char *buf, 154 CORE_ADDR pc) 155{ 156 int i; 157 unsigned int newpc = pc; 158 159 supply_register (regcache, I386_EIP_REGNUM, &newpc); 160 161 for (i = 0; i < i386_NUM_ST_COLLECT_GREGS; i++) 162 if (i386_st_collect_regmap[i].offset != -1) 163 { 164 switch (i386_st_collect_regmap[i].size) 165 { 166 case 4: 167 supply_register (regcache, i, 168 ((char *) buf) 169 + i386_st_collect_regmap[i].offset); 170 break; 171 case 2: 172 { 173 unsigned long reg 174 = * (short *) (((char *) buf) 175 + i386_st_collect_regmap[i].offset); 176 reg &= 0xffff; 177 supply_register (regcache, i, ®); 178 } 179 break; 180 default: 181 internal_error (__FILE__, __LINE__, "unhandled register size: %d", 182 i386_st_collect_regmap[i].size); 183 } 184 } 185} 186 187#endif /* HAVE_UST */ 188 189 190/* This is only needed because reg-i386-linux-lib.o references it. We 191 may use it proper at some point. */ 192const char *gdbserver_xmltarget; 193 194void 195initialize_low_tracepoint (void) 196{ 197 init_registers_i386_linux (); 198} 199